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<a name="GstTaskPool"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="GstTaskPool.top_of_page"></a>GstTaskPool</span></h2>
<p>GstTaskPool — Pool of GStreamer streaming threads</p>
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<div class="refsect1">
<a name="GstTaskPool.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="GstTaskPool.html#GstTaskPoolFunction" title="GstTaskPoolFunction ()">*GstTaskPoolFunction</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstTaskPool.html" title="GstTaskPool"><span class="returnvalue">GstTaskPool</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstTaskPool.html#gst-task-pool-new" title="gst_task_pool_new ()">gst_task_pool_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstTaskPool.html#gst-task-pool-prepare" title="gst_task_pool_prepare ()">gst_task_pool_prepare</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a>
</td>
<td class="function_name">
<a class="link" href="GstTaskPool.html#gst-task-pool-push" title="gst_task_pool_push ()">gst_task_pool_push</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstTaskPool.html#gst-task-pool-join" title="gst_task_pool_join ()">gst_task_pool_join</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstTaskPool.html#gst-task-pool-cleanup" title="gst_task_pool_cleanup ()">gst_task_pool_cleanup</a> <span class="c_punctuation">()</span>
</td>
</tr>
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</table></div>
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<div class="refsect1">
<a name="GstTaskPool.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstTaskPool.html#GstTaskPool-struct" title="struct GstTaskPool">GstTaskPool</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstTaskPool.html#GstTaskPoolClass" title="struct GstTaskPoolClass">GstTaskPoolClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstTaskPool.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
    <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
        <span class="lineart">╰──</span> <a class="link" href="GstObject.html" title="GstObject">GstObject</a>
            <span class="lineart">╰──</span> GstTaskPool
</pre>
</div>
<div class="refsect1">
<a name="GstTaskPool.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/gst.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="GstTaskPool.description"></a><h2>Description</h2>
<p>This object provides an abstraction for creating threads. The default
implementation uses a regular GThreadPool to start tasks.</p>
<p>Subclasses can be made to create custom threads.</p>
</div>
<div class="refsect1">
<a name="GstTaskPool.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="GstTaskPoolFunction"></a><h3>GstTaskPoolFunction ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
<span class="c_punctuation">(</span>*GstTaskPoolFunction<span class="c_punctuation">)</span> (<em class="parameter"><code><span class="type">void</span> *user_data</code></em>);</pre>
<p>Task function, see <a class="link" href="GstTaskPool.html#gst-task-pool-push" title="gst_task_pool_push ()"><code class="function">gst_task_pool_push()</code></a>.</p>
<div class="refsect3">
<a name="GstTaskPoolFunction.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data for the task function</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-task-pool-new"></a><h3>gst_task_pool_new ()</h3>
<pre class="programlisting"><a class="link" href="GstTaskPool.html" title="GstTaskPool"><span class="returnvalue">GstTaskPool</span></a> *
gst_task_pool_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Create a new default task pool. The default task pool will use a regular
GThreadPool for threads.</p>
<div class="refsect3">
<a name="gst-task-pool-new.returns"></a><h4>Returns</h4>
<p>a new <a class="link" href="GstTaskPool.html" title="GstTaskPool"><span class="type">GstTaskPool</span></a>. <a class="link" href="GstObject.html#gst-object-unref" title="gst_object_unref ()"><code class="function">gst_object_unref()</code></a> after usage. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-task-pool-prepare"></a><h3>gst_task_pool_prepare ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_task_pool_prepare (<em class="parameter"><code><a class="link" href="GstTaskPool.html" title="GstTaskPool"><span class="type">GstTaskPool</span></a> *pool</code></em>,
                       <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>Prepare the taskpool for accepting <a class="link" href="GstTaskPool.html#gst-task-pool-push" title="gst_task_pool_push ()"><code class="function">gst_task_pool_push()</code></a> operations.</p>
<p>MT safe.</p>
<div class="refsect3">
<a name="gst-task-pool-prepare.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>pool</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstTaskPool.html" title="GstTaskPool"><span class="type">GstTaskPool</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>an error return location</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-task-pool-push"></a><h3>gst_task_pool_push ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a>
gst_task_pool_push (<em class="parameter"><code><a class="link" href="GstTaskPool.html" title="GstTaskPool"><span class="type">GstTaskPool</span></a> *pool</code></em>,
                    <em class="parameter"><code><a class="link" href="GstTaskPool.html#GstTaskPoolFunction" title="GstTaskPoolFunction ()"><span class="type">GstTaskPoolFunction</span></a> func</code></em>,
                    <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                    <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>Start the execution of a new thread from <em class="parameter"><code>pool</code></em>
.</p>
<div class="refsect3">
<a name="gst-task-pool-push.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>pool</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstTaskPool.html" title="GstTaskPool"><span class="type">GstTaskPool</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>func</p></td>
<td class="parameter_description"><p>the function to call. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="The callback is valid until first called."><span class="acronym">scope async</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>data to pass to <em class="parameter"><code>func</code></em>
. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="This parameter is a 'user_data', for callbacks; many bindings can pass NULL here."><span class="acronym">closure</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>return location for an error</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-task-pool-push.returns"></a><h4>Returns</h4>
<p>a pointer that should be used
for the gst_task_pool_join function. This pointer can be <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, you
must check <em class="parameter"><code>error</code></em>
to detect errors. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-task-pool-join"></a><h3>gst_task_pool_join ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_task_pool_join (<em class="parameter"><code><a class="link" href="GstTaskPool.html" title="GstTaskPool"><span class="type">GstTaskPool</span></a> *pool</code></em>,
                    <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> id</code></em>);</pre>
<p>Join a task and/or return it to the pool. <em class="parameter"><code>id</code></em>
 is the id obtained from
<a class="link" href="GstTaskPool.html#gst-task-pool-push" title="gst_task_pool_push ()"><code class="function">gst_task_pool_push()</code></a>.</p>
<div class="refsect3">
<a name="gst-task-pool-join.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>pool</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstTaskPool.html" title="GstTaskPool"><span class="type">GstTaskPool</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>id</p></td>
<td class="parameter_description"><p>the id</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-task-pool-cleanup"></a><h3>gst_task_pool_cleanup ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_task_pool_cleanup (<em class="parameter"><code><a class="link" href="GstTaskPool.html" title="GstTaskPool"><span class="type">GstTaskPool</span></a> *pool</code></em>);</pre>
<p>Wait for all tasks to be stopped. This is mainly used internally
to ensure proper cleanup of internal data structures in test suites.</p>
<p>MT safe.</p>
<div class="refsect3">
<a name="gst-task-pool-cleanup.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>pool</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstTaskPool.html" title="GstTaskPool"><span class="type">GstTaskPool</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="GstTaskPool.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstTaskPool-struct"></a><h3>struct GstTaskPool</h3>
<pre class="programlisting">struct GstTaskPool;</pre>
<p>The <a class="link" href="GstTaskPool.html" title="GstTaskPool"><span class="type">GstTaskPool</span></a> object.</p>
</div>
<hr>
<div class="refsect2">
<a name="GstTaskPoolClass"></a><h3>struct GstTaskPoolClass</h3>
<pre class="programlisting">struct GstTaskPoolClass {
  GstObjectClass parent_class;

  void      (*prepare)  (GstTaskPool *pool, GError **error);
  void      (*cleanup)  (GstTaskPool *pool);

  gpointer  (*push)     (GstTaskPool *pool, GstTaskPoolFunction func,
                         gpointer user_data, GError **error);
  void      (*join)     (GstTaskPool *pool, gpointer id);
};
</pre>
<p>The <a class="link" href="GstTaskPool.html#GstTaskPoolClass" title="struct GstTaskPoolClass"><span class="type">GstTaskPoolClass</span></a> object.</p>
<div class="refsect3">
<a name="GstTaskPoolClass.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstTaskPoolClass.prepare"></a>prepare</code></em> ()</p></td>
<td class="struct_member_description"><p>prepare the threadpool</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstTaskPoolClass.cleanup"></a>cleanup</code></em> ()</p></td>
<td class="struct_member_description"><p>make sure all threads are stopped</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstTaskPoolClass.push"></a>push</code></em> ()</p></td>
<td class="struct_member_description"><p>start a new thread</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstTaskPoolClass.join"></a>join</code></em> ()</p></td>
<td class="struct_member_description"><p>join a thread</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="GstTaskPool.see-also"></a><h2>See Also</h2>
<p><a class="link" href="GstTask.html" title="GstTask"><span class="type">GstTask</span></a>, <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a></p>
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